环氧树脂改性含硅自消光水性聚氨酯树脂的制备及性能

Preparation and properties of self-matting waterborne polyurethane with silicon modified by epoxy resin

摘要:

以聚己二酸1，4－丁二醇酯多元醇(PBA)、异佛尔酮二异氰酸酯(IPDI)、二羟甲基丙酸（DMPA）、1，4-丁二醇（BDO）、端羟丙基聚二甲基硅氧烷(PDMS)和环氧树脂(E-51)为单体合成聚氨酯预聚体，三乙胺（TEA）作为中和剂，乙二胺（EDA）作为后扩链剂，合成了一系列环氧树脂改性含硅自消光水性聚氨酯树脂乳液。采用粒度分析仪测定乳液粒径、FTIR表征胶膜表面结构、SEM观察胶膜表面，并分析了胶膜的光泽度、水接触角、热力学等性能。结果表明：在n(PBA)：n(PDMS)=1:2的条件下，环氧树脂添加量为5 %时，乳液粒径为1152 nm，胶膜60?光泽度为3.4；水接触角为107.3?，疏水性能最优；胶膜拉伸强度可达24.42 MPa，断裂伸长率在362 %，力学性能最优；胶膜热失重50 %时温度较未添加E-51的胶膜提高了18.3 ℃。

Abstract:

A series of epoxy resins were synthesized with poly (1,4-butanediol adipate) polyol (PBA), isophorone diisocyanate (IPDI), dimethylolpropionic acid (DMPA), 1,4-butanediol (BDO), hydroxypropyl terminated poly (dimethylsiloxane) (PDMS) and epoxy resin (E-51) as monomers, triethylamine (tea) as neutralizer and ethylene diamine (EDA) as post chain extender Modified silicone containing self extinction waterborne polyurethane resin emulsion. Particle size analyzer was used to measure the particle size of the emulsion, FTIR to characterize the surface structure of the film, SEM to observe the surface of the film, and the properties such as gloss, water contact angle and thermodynamics of the film were analyzed. The results show that under the condition of n (PBA): n (PDMS) =1:2, When the mass fraction of E-51 is 5 %, the emulsion size is 1152 nm, the 60? gloss of the film is 3.4, the water contact angle is 107.3?, the tensile strength is 24.42 MPa, the elongation at break is 362 %, the thermal decomposition temperature at 50 % mass loss rate, compared with the unmodified polyurethane film, is increased by 18.3 ℃ ．